IACV Control Circuit: Wiring Diagram

1. Disconnect the vacuum hose from the port F on the vacuum switching valve (for ACIS).
2. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
3. Start the engine.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the ACIS VSV.
5. Check the VSV's air flow when switching the VSV.
   Fig 2: Identifying VSV'S Air Flow Switching VSV

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Condition	Specified Condition
   VSV is ON	Air from port E flows out through port F
   VSV is OFF	Air from port E flows out through the air filter

NG : Go to step   4 

OK : GO TO NEXT STEP. 

1. Check the condition of the vacuum hoses between the intake manifold, vacuum switching valve (for ACIS) and IACV.
   1. The vacuum hoses are connected securely.
   2. Vacuum hoses are not cranked or damaged.

      OK: 

      The vacuum hoses are connected securely and not cracked or damaged. 

NG : REPAIR OR REPLACE VACUUM HOSES 

OK : GO TO NEXT STEP. 

1. Inspect the intake air control valve (ON-VEHICLE INSPECTION ).

NG : REPLACE INTAKE AIR CONTROL VALVE 

OK : REPLACE ECM 

1. Check that air flows from port E to the air filter.
2. Apply positive (+) battery voltage across the terminals.
3. Check that air flows from port E to port F.
   Fig 3: Inspecting Vacuum Switching Valve

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE VACUUM SWITCHING VALVE 

OK : GO TO NEXT STEP. 

1. Disconnect the E32 vacuum switching valve (for ACIS) connector.
2. Disconnect the E6 ECM connector.
3. Measure the resistance of the wire harness side connectors.
   Fig 4: Identifying E32 Vacuum Switching Valve (For ACIS) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   E32-2 - E6-3 (ACIS)	Below 1 Ω
   E32-2 or E6-3 (ACIS) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : GO TO NEXT STEP. 

1. Remove the integration relay from the engine room No. 2 junction block.
2. Measure the resistance of the EFI MAIN relay.
   Fig 5: Identifying Integration Relay At Engine Room Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Terminal Connections	Specified Condition
   2A-8 - 2C-1	10 kΩ or higher
   2A-8 - 2C-1	Below 1 Ω (when battery voltage is applied to terminals 2A-6 and 2A-7)

NG : REPLACE INTEGRATION RELAY 

OK : REPLACE ECM